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topic 29921

Chrome Plating Baking Process



2004

We are having steel Grade 8 Hex Head bolts plated with decorative chrome. I am concerned about the strength of the bolts (hydrogen embrittlement) since the platers did not begin the baking process until 48 hours after the chrome was applied. Could this delay cause damage or lasting effects or is it unimportant?

Thank you.

Curt Fisher
Steel fabrication, fasteners distribution - Wallingford, Connecticut, USA


2004

It can have catastrophic effect.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com - Pine Beach, New Jersey
Striving to live Aloha


2004

You were kind enough to answer my letter. Could you please tell me what is the most commonly cited spec for the application (having steel Grade 8 Hex Head bolts plated with decorative chrome). And does it specifically address the time frame limits (how soon after plating) for baking or quenching? Thank you for your help.

Curt Fisher
Steel fabrication, fastener distribution - Wallingford, Connecticut, USA


2004

The time frame in spec's is usually within the hour. In grade 8 fasteners you should maintain this time limit, since the hardness of this fasteners could make them even more vulnerable.

Carlos Cielak
plating shop - Mexico City, DF, Mexico


2004

The Spec you are looking for is FED QQ-C-320 [affil. link to spec at Techstreet] type I.

Rodney Nichols
- Bridgeport, Connecticut

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